This 10-minute timer was found in the July 1994 Radio Electronics magazine. The relay must be sensitive to the supply voltage used. The capacitors determine time ranges.
This is a typical amplifier circuit for a commercial tape recorder from 1968. The circuit has an...
This circuit functions as a variable capacitor controlled by a potentiometer, multiplying the...
This differentiator for the positive front of the input signal can be elaborated based on any...